Collet feed mechanism for automatic cutting machines



0. AMIET Jan. 22, 1952 COLLET FEED MECHANISM FOR AUTOMATIC CUTTING MACHINES Original Filed Aug. 1, 1947 FIG. 212 224-207 Oscar Am'uet Invader Patented Jan. 22, 1952 COLLET FEED MECHANISM FOR AUTO- ar o CUTTING MACHINES Oscar Amiet, La Chaux de Fonds, Switzerland,

assignor t Mistress Albert Murbach, Colombier, Switzerland r Original application August 1, 1947, Serial No. 765,581. Divided and this application March 1, 1949, Serial No. 78,920. In Switzerland June 2 Claims. (Cl. 27943) 1 The present application is a division of my 00- pending application filed August 1, 1947, Serial No. 765,581.

The present invention refers to an automatic 2 operation with a sleeve 214, with the lugs 2l5 of which it is engaged by oval holes 216. This sleeve can slide axially on the base 2|! of the finger 209 under the action of the two pins 218,

cutting machine, of the type in which a tool- 5 one of which is in the axis, and the other at holder carrying at least one cutting tool is mountright angle to the axis of the base 211; these ed revolvably around the axis of the bar to be two pins cooperate with a contacting screw 2I9 cut, and a device for guiding and feeding autoof a lever 220 pivoted at 22E and keyed on a matically the bar to be cut. This machine is common axis with a lever 220a operated by the characterized by the fact that an additional guidcam 223.

ing element is provided for the bar to be cut, A milled nut 222 screwed at the end of the said element being arranged coaxially with the finger 209 allows the lever 208 to be blocked in first mentioned guiding device but on the op- Working or resting positions.

posite side of the plane of rotation of the cut- The Operation of s machine i as follows! ting tool, whereby the bar is held on both sides The clamping chuck 204 is set exactly in alignof the tool. This guiding element is adjustment with the guiding die 202 by adjusting the able in order to be able to be aligned exactly With Screws 205 a d 206- W n cut he b s the axis of the bar to be cut. held both in chuck and die, whereby a great stiff- The attached drawing represents schematically ness is secured. Immediately before t e autoand partially, by way of example, one embodi- 29 matic feed of the bar, the chuck 204 is open. As ment of the invention. soon as the bar has been fed, the chuck 204 is Fig. 1 is a partial front view of this embodiclamped again on the bar. ment. This device enables increasing the production Fig. 2 is a partial elevation view with partial and the precision. The bar being held on both section along line II II of Fig, 1, sides of the plane of rotation of the cutting tools,

The machine comprises a revolvable toolit has a far smaller deflection than when it is holder at the center of which is placed a held on one side only, and One can remove Chips guiding die 202, in which passes the bar 203 to of greater thickness. In addition, the pieces are be cut, the automatic feed of which is realised by cut cleanly without Stud- T Cl p h k a feeding wheel 200 actionated by a cam not 30 being dj the machine is p ed for shown on the drawing. Working precision pieces.

In front of the guiding die 202, there is a clamp h advantage of h s ac i e is t us to ening chuck 204, the opening and closing movesure an absolute rigidity of the work-piece and ment of which is controlled by a cam 223. In to p rm t f a h pr isionaddition, the chuck 204 can be aligned exactly WhatI claim is: with the die 202 by means of the adjusting screws 1. In an automatic cutting machine, a frame, 205 and 206. To that effect, the chuck 204 is aclamping chuck, aswinging arm pivoted on said mounted on a sledge 201 apt to slide along a lever frame and adapted to be moved along an arc, 208 under the action of a screw 200. Said lever a sledge sliding longitudinally on said arm 208 is pivoted at 209, for allowing swinging it for along a radius of said are and carrying said removing the chuck 204 from the bar, for example, when one wants to adjust the tools on the tool-holder 201. The screw 205 bears by its end on an abutting finger 210 secured on the frame of the machine.

The chuck 204 is closed by the spring 2 I 2, which tightens the inner cone of the sleeve 224 on the outer cone of the chuck. It opens by an axial motion of the sleeve 224 towards the chuck 202. This motion, caused by the lever 2| l, liberates the cone of the chuck 204, which is retained axially by its rear end, screwed in an arm 225 of the sledge. The lever 2 is pivoted at 2I3 in the lever 208 and is itself controlled at its opposite end, which is also fork-shaped for coclamping chuck, an adjusting screw cooperating with said sledge to adjust its position on said arm, an adjustable abutment screw cooperating with said arm to adjust its position relative to the frame, whereby the centering of the chuck is adjustable in two directions at right angles to 4 Just its position relative to the frame, a locking REFERENCES CITED sleeve slidingly mounted on Said chucka Spring The following references are of record in the tending to maintain said sleeve in the locking file of this patent: position,a release lever mounted on said swinging arm and actiiatiiig said slevefalbclging ,5 UNITE]? STAYES for said swinging arm, operative means for said Number Name Date release lever carried by the pivot of said swing- 1,279,965 Bacon Sept. 24, 1918 mg arm; whereby the centering of the chuck is 1,366,15 Whitaker Jan. 25, 1921 adjustable in two directions "'at 'rig'ht n'gisftb {1;662g571 Friek Mar. 13, 1928 one another, and, by swinging said lv'r, "the in 1,782,692 Lawson Nov. 25, 1930 chuck'can be removed fromthe-shafit, without disturbing the adjusting ofsaideentzarin'g.

OSCAR AMIET. 

